Polishing-wheel.



C. J. ANDERSON.

POLISHING WHEEL APPLICATION FILED SEPT. 21. 3915.

Lgmfifig, Patented 00. 31,1916.

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CHARLES J. ANDERSON, 0F MARINETTE, WISCONSIN.

POLISHING-WHEEL.

Specification of Letters Patent.

Patented @et. 3f, 19PM").

Application filed September 27, 1915. Serial No. 52,815.

To all whom it may concern:

Beit known that 1, CHARLES J. ANDER- SON, a citizen of the United States, and resident of Marinette, in the county of Marinette and State of Wisconsin, have invented certain new and useful Improvements in Polishing-Wheels; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention refers to polishing wheels of the scroll type and has for its object to provide groups of peculiarly arranged flanges constitutin the polishing surfaces, whereby the capacity of the wheel is materially increased. Heretofore practice has demonstrated that the scroll type of wheel having a central grout cavity tends to feed the material into said cavity, wherein it is confined and thus choking at this point will lift the wheel b'odily to a certain degree and thereby prevent proper bite or polishing effect, which is the function of the scroll.

My invention is designed to overcome the above referred to objectionable features and, owing to the peculiar arrangement and shape of several groups of spiral flanges, surfaces of said flanges about the. grout cavity are tangentially disposed to the axis of the revoluble head, whereby the tendency of the grout to choke is eliminated due to the fact that the surplus contained in the cavity is free to escape beyond tangential sections of certain of the scrolls. Thus the center of the polishing wheel is automatically kept free from choking, whereby the polishing or biting eficiency of the wheel as a whole can be regulated to a nicety depending upon the angular arrangement of the center terminals of said spirals.

With the above objects in view the invention consists in certain peculiarities of construction and combination of parts as set forth hereinafter with reference to the accompanying drawings and subsequently claimed.

In the drawings Figure 1 represents an inverted plan view of a polishing wheel equipped with scroll flanges embodying the features of my. invention; Fig. 2, a side ele-' vation of the same, and Fig. 3, an inverted plan view of a section of a polishing wheel showing'a modified form of the scroll arrangement from that shown in Fig. 1.

Referring by characters to-the drawings, 1 represents a circular head which, in this exemplification of my invention, is provided with four groups of scroll flanges. Each group of flanges comprises an outer scroll member 2, winch extends from'ithe outer edge of the head in the form hf a gentle contracting curve for a distance approximating one-quarter of a circle terminating at a). From this point the outer scroll of the group is contracted by a comparatively sh0rt curved section y toward the axis of the head, which curved section merges into a straight section 2 that, in conjunction with the section 3 is tangentially disposed relative to the axis of oscillation. In this exemplification of my invention the straight tangential section 2 is disconnected or interrupted from the end of the section y, whereby a channel y is formed between these parts. Figuring from the direction of rotation of,the head, as indicated by the arrow, the preceding outer scroll member 2 of the next group is similarly positioned with relation to the axis of the head and the straight tangential section a is, as shown, positioned at a right angle to the first mentioned section 2, but terminates at a slight distance from the first mentioned section 2, whereby a grout channel 2" is formed between said straight sections. Each group has a spiral inner scroll flange 3 and an intermediate scroll flange 4, the points of said flanges being dropped back of the point of the first or outer flange of the series. These flanges are arranged approximately parallel with the outer flange and their terminals 3, 4c, are abruptly curved inwardly and tangentially with relation head in a line which, if extended, would intersect the preceding straight section 2. The inner sections 3', 4, however, are stopped short of the section 2, whereby channels a, b, respectively, are formed at their inner edges with relation to the aforesaid straight section a, which is, as shown, approximately positioned at a right angle to the terminal edges of the inner ends of these scrolls. The remaining groups are similarly disposed with relation to each other and correspond to the group just described and, in this exemplification of my invention, the straight sections 2 are bolted or otherwise secured to the head, whereby one or more of the same may be removed if desired to thus adjust the bite of the polisher under certain conditions. As best shown in Fig. 2, the outer scroll flanges 2 are formed/wlth backwardly tapered shearing edgwfl' to facilito the axis of the tate the operation of the device. Fig. 3 illustrates the same arrangement of groups of scrolls with the exception that in this instance the straight tangential sections 2 form continuations of the inner sections 3 of the outer scrollflange 2. Hence the cavity 3 in this instance is dispensed with.

By the peculiar arrangement of the polishing spirals, when the wheel is in operation, the material will be gradually drawn toward the center of the wheel and as the grout fills up the grout cavity A to the level of the height of the flange sections z, continual rotation of the wheel-will not tend to further increase this choke, but will, owing to the angular position of the section a, which is at approximately a right angle to the line of escape, cause the grout to flow between the polishing edges of said section z and the stone being operated upon, whereby choking is automatically relieved and the polisher will operate continuously and exert the desired amount of biting or polishing force upon the surface being worked. The eificiency of the arrangement is further inincreased by the series of channels or passages a, b, and 3 whereby the material which is drawn to the center of the head is caused to travel in and out to a certain degree and'eventually find its way into thecavity 'A. Furthermore, owing to the fact that the inner ends of the several scrolls tend to revolve in a track or groove or, in

other words, the polishing effect is similar to that of a straight section being drawn across a surface to be polished at a right an 1e to its length.

claim:

1. In a polishing wheel, the combination of a rotatory head havin groups of spiral flanges extending there rom, each group comprising an outer spiral flange extended inwardly and terminating at a point near the center of the head with a tangential section positioned approximately at a right angle to the corresponding straight section of the preceding outer flange, and intermediate scrolls associated with the outer scroll, each of the same ;being terminated with an abrupt curved inner end that, if extended, would intersect the straight section of the aforesaid preceding outer flange.

2. In a polishing wheel, the combination of a rotatory head havin groups of spiral flanges extending there rom, each group comprising an outer spiral flange having its inner end portion abruptly curved and terminati'ng with an interrupted straight section at a tangent to the head axis and at an approximate right angle to the corresponding straight section of the outer flange of the preceding group, a series of shorter scrolled flanges included in the group, the said series being terminated with abrupt curved inner ends spaced from the straight section of the channels. I

In testimony that I claim the foregoing I have hereunto set my hand at Marinette,

in the county of Marinette and State of Wisconsin, in the resence of two witnesses.

C AS. J.'ANDERSON.

Witnesses:

Roar. Conn, V FRED LA VALLIERE.

preceding group to form 

